5
Clearances to Combustible Materials
This furnace is Design Certified in the U.S. and Canada
by CSA International for the minimum clearances to
combustible materials.
NOTE:
The furnace is listed for
installation on combustible or non-combustible flooring.
However, wood is the only combustible flooring allowed
for installation. To obtain furnace base model number and
specific clearance information, refer to the furnace rating
plate, located inside of the furnace cabinet.
Access for positioning and servicing the unit must be
considered when locating unit. The need to provide
clearance for access to panels or doors may require
clearance distances over and above the requirements.
Allow 18 inches minimum clearance from the front of
the unit. However 36 inches is strongly recommended.
See Table 1 for minimum clearance requirements.
Table 1. Minimum Clearance Requirements
INSTALLATION CLEARANCES
CLOSET
ALCOVE
Front *
1"
1"
Rear
0"
0"
Sides
0"
0"
Top
6"
6"
Duct w/in 3ft of furnace
1/4"
1/4"
Vent
0”
0”
Plenum Without Coil Box
1"
1"
Plenum With Coil Box
0”
0”
NOTES:
Alcove Installations - Allow 18 in. minimum clearance
from front of unit to nearest wall or partition for servicing.
Closet installations - Require a return air grill installed
in the door or a partially louvered door across the
opening for proper air circulation. For clearances 6” or
greater, the closet must have an open free area of 235
in
2
minimum. For special clearances between 1” - 5”,
requirements are a louvered door with a minimum of
250 in
2
(1613 cm
2
) free area. A fully louvered closet door
is strongly recommended for both installation types.
LEFT
SIDE
FRONT
RIGHT
SIDE
REAR
VENT
The ductwork should be appropriately sized to the capacity
of the furnace to ensure its proper airflow rating. For
installations above 2,000 ft., the furnace should have a
sea level input rating large enough that it will meet the
heating load after deration for altitude.
Combustion Air Quality
CAUTION:
Combustion air must not be drawn from a
corrosive atmosphere.
To maximize heat exchanger life, the combustion air
must be free of chemicals that can form corrosive acidic
compounds in the combustion gases. The required source
of combustion air is to use outdoor air.
Exposure to the following substances in the combustion
air supply will result in safety and performance related
problems. The list below contains examples of chemical
containments found in a wide variety of common
commercial household products:
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine based swimming pool chemicals
• Water softening chemicals
• De-icing salts or chemicals
• Carbon Tetrachloride
• Halogen type refrigerants
• Cleaning solvents (perchloroethylene)
• Printing inks, paint removers, varnishes, etc.
• Hydrochloric Acid
• Cements and glues
• Antistatic fabric softeners
• Masonry acid washing materials
Heating Load
This furnace should be sized to provide the design heating
load requirement. Heating load estimates can be made
using approved methods available from Air Conditioning
Contractors of America (Manual J); American Society of
Heating, Refrigerating, and Air Conditioning Engineers;
or other approved engineering methods.
Excessive
oversizing of the furnace could cause the furnace
and/or vent to fail prematurely.
Condensate Disposal
The method for disposing of condensate varies according
to local codes. Consult your local code or authority having
jurisdiction. Neutralizer kit P/N 902377 is available for
use with this furnace.
Please follow the instructions
provided with the kit.
